S/2025 U 1

S/2025 U 1 is a small moon of Uranus, with an estimated diameter between. It was the 29th moon identified in the Uranian system. The discovery was announced in August 2025 by a team of astronomers led by Maryame El Moutamid, who found the moon in James Webb Space Telescope NIRCam images taken on 2 February 2025.
The moon orbits about from the center of Uranus with an orbital period of. Like the other inner moons of Uranus, it follows a nearly circular orbit along Uranus's equatorial plane. Due to its small size, it appears extremely faint with a near-infrared apparent magnitude of 25.5—too faint to be seen by the Hubble Space Telescope and the Voyager 2 spacecraft.

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Name

S/2025 U 1 is the provisional designation of this unnamed moon. By convention, the moons of Uranus are named after characters from the plays of William Shakespeare and Alexander Pope. A proper name will be given once it is approved by the International Astronomical Union. Co-discoverer Mark R. Showalter has stated in a 2025 New Scientist article that "there have been discussions but no shortlist as yet."

Orbit

S/2025 U 1 is the 14th known member of Uranus's inner moons, which are small moons that orbit interior to the planet's five largest moons. S/2025 U 1 follows a nearly circular orbit around Uranus's equatorial plane, at a distance of from the planet's center with an orbital period of. S/2025 U 1 is located outside the edge of Uranus's inner ring system, between the orbits of Ophelia and Bianca. The nearly circular orbit of S/2025 U 1 suggests that it formed near its current location, according to El Moutamid.